class Settings:
    """存储游戏《外星人入侵》中所有设置的类"""
    def __init__(self):
        """初始化游戏的静态设置"""
        # 屏幕设置
        self.screen_width = 1000
        self.screen_height = 600
        # 设置背景色
        self.bg_color = (230, 230, 230)
        # 飞船的设置
        self.ship_limit = 3
        # 子弹设置
        self.bullet_width = 3
        self.bullet_widths = 3000
        self.bullet_height = 15
        self.bullet_heights = 1
        self.bullet_color =(255,0,0)
        # 外星人设置
        self.fleet_drop_speed = 10
        # 以什么速度加快游戏的节奏
        self.speedup_scale = 1.1
        self.initialize_dynamic_settings()
    def initialize_dynamic_settings(self):
        """初始化随游戏进行而变化的设置"""
        self.ship_speed = 5.0
        self.bullet_speed = 6.0
        self.alien_speed = 1.0
        # fleet_direction为1表示向右移动，为-1表示向左移动
        self.fleet_direction = 1
    def increase_speed(self):
        """提高速度设置的值"""
        self.ship_speed *= self.speedup_scale
        self.bullet_speed *= self.speedup_scale
        self.alien_speed *= self.speedup_scale